40 2/3•39 1/3=?

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402/3•391/3=?402/3•391/3=?402/3•391/3=?402/3•391/3=(40+2/3)(40-2/3)=1600-4/9

40 2/3•39 1/3=?
40 2/3•39 1/3=?

40 2/3•39 1/3=?
40 2/3•39 1/3
=(40+2/3)(40-2/3)
=1600-4/9
=1599又5/9

40 2/3•39 1/3=
=122*118/9
=(120+2)(120-2)/9
=(14400-4)/9
=14396/9
=1599又5/9